Method of making valve seats



July 9, 1929. A. H. LEIPERT METHOD OF MAKING VALVE SEATS Filed June 1928GJl 4Q W Hagan?! liLaioel'l flbtomm J till lid

Patented July 9, 1929.

UNITED STATES AUGUST H. LEIPERT, 0F COLLEGE POINT,

I 1,720,486 PATENT OFFICE.

NEW YORK, ASSIGNOR TO INTERNATIONAL MOTOR COMPANY, OF NEW YORK, N. Y., ACORPORATION OF DELAWARE.

METHOD on Max Application filed June 5,

As a means for affording a more perfect valve seat and promoting thecoollng thereof,

it has been proposed to form the valve seat,

( same, the subject matter embodied herein redating to the same generalconstruction as that shown in the above application.

It has been found that the joint between the valve seat andthe cylindercasting can be materially improved and the heat transfer thereloetweencorrespondingly increased if the valve seat is formed in such mannerthat the engagement by-the undercut seat of the'cylinder casting isrendered tight both when the engineis hot and when cold. By reason of meVALVE sna'rs.

1928. Serial No. 282,988.

casting and an annular ring of aluminum bronze c is placed as shown 1nFigure 1. A suitable expander d is then applied to force the ring 0 intothe groove (1 so that it fills the entire portion thereof as shown inFigure 2. Suitable notches a are formed in the cylinder casting and thematerial of the valve seat is forced into these, thus positively se-.

valve seat is initially heated and is expanclmg faster than the cylindercasting, the valve seat grips against the undercut portion a of thegroove a. When the valve seat is contracting 1t grips against theexternal periphthe fact that the valve seat is formed of cry a of therib a In this manner, the seat aluminum bronze and the cylinder castingof cast iron, the coeflicients of expansion of these two elements differand the expansion thereof varies with the variation in temperature.

The present invention has for an object the provision of a valve seatand method of forming the same which insures tightness thereof under alloperating c nditions, thus materially decreasing the te perature of the.valve seat and bettering the operating conditions thereof. Theinvention will be understood more fully in connection with theaccompanying d rawmgs, wherein I Figure l is a view in section showingthe manner in which the cylinder casting is undercut to receivethe-seat.

, Figure 2 isa view in section taken on line a 2-2 of Figure 3, andlooking in the direction of the arrows.

Figure 3 .is a plan view of the valve and seat construction shown inFigure .2.

Referring to the above drawings, the cylinder'casting a is formed withan annular groove a which is undercut at a Protruding upwardly into thegroove as is an annular rib a about which the valve seat is formed. lnforming the seat, a recessed plate 5 is bolted to the top of thecylinder is rigidly held in position and movement cylinder'castingcomprising forming means III the casting to retain the seat in position,placin forme adjacent the retaining means, expanding the metal intoposition,'heating the metal, and again expanding the same.

2. The method offorming a valve seat in a cylinder casting comprisingforming means in the casting to retain'the seat in position,

the metal from which the seat is placing the metal from which the seatis 9,

formed adjacent the retaining means. expand- ,ing the metal intoposition, heatin the metal, and again expanding the same w ile heated.

3. The method of forming a valve seat in a cylinder. casting comprisingforming means in the casting to retain the seat in position, placing themetal from which the seat is formed adjacent the retaining means,heating the casting. expanding the metal into position while the castingis heated, heating the metal, andagain expanding the same.

4. The method of forming a valve seat in a cylinder casting comprisingforming means in the casting to retain the seat in position, no

- placing the metal from which the seat is formed adjacent the retainingmeans heating the castings, expanding the metal into position While thecasting is heated, allowing the 5 casting to cool, heating the metal,and again expanding the same.

I 5. The method of forming a valve seat in a cylinder casting comprisingforming means in the casting to retain the seat in position,

placing the metal from which the seat is formed adjacent the retainingmeans, heat ing the casting, expanding the metal into position while thecasting is heated, allowing the casting to cool, heating the metal, andagain expanding the same while heated.

This specification signed this 31st day of May, A. D. 1928.

AUGUST H. LEIPERT.

